docs: def refresh(self, serviceDefinition=True):
          """
          The refresh operation refreshes a service, which clears the web
          server cache for the service.
          """
          url = self._url + "/MapServer/refresh"
          params = {
              "f" : "json",
              "serviceDefinition" : serviceDefinition
          }
  
          res =  self._post(url=self._url,
                               param_dict=params,
                               securityHandler=self._securityHandler,
                               proxy_url=self._proxy_url,
                               proxy_port=self._proxy_port)
          self.__init()
          return res